<h:panelGroup layout="block"
  xmlns="http://www.w3.org/1999/xhtml"
  xmlns:h="http://java.sun.com/jsf/html"
  xmlns:nxu="http://nuxeo.org/nxweb/util"
  xmlns:ui="http://java.sun.com/jsf/facelets">

  <nxu:set var="selection" value="true">
    <ui:include src="./add_to_collection.xhtml" />
  </nxu:set>

</h:panelGroup>